Depending on the tab selected, enter either (a) two proof stresses and the corresponding permanent strains, or (b) two
stresses and the corresponding total strains. Values of Young's modulus and the tensile strength of the material are also required.

Note that the A values entered must be less than the B values.

The theoretical basis for the generalised stress-strain form used by the app is detailed in
ESDU 89052
and
ESDU 76016.